Subtle body. The somatic unconscious, a
transcendental concept
involving the relationship between mind and body.

The part of the unconscious which is designated
as the subtle body
becomes more and more identical with the functioning
of the body, and
therefore it grows darker and darker and ends in the
utter darkness of
matter. . . . Somewhere our unconscious becomes
material, because the
body is the living unit, and our conscious and our
unconscious are
embedded in it: they contact the body. Somewhere
there is a place where
the two ends meet and become interlocked. And that
is the [subtle body]
where one cannot say whether it is matter, or what
one calls
"psyche."[ Nietzsche's Zarathustra, vol.
1, p.
441.]